robinson



Improvement in Rock DriHing-Machnes.

Patented June 6, 1871.

infami/o,

nomini; w. ROBINSON, Or BURLINGTON, VERMONT.

lMPRovEaEN-r is Roca-'Damme einer-nues.

Specification forming part of Letters Patent No. 115,641, dated June 6,1871.

To ali whom it may concern:

Be it known that I, NORMAN W. ROBINSON, of Burlington, in the county ofChittenden and State of Vermont, have invented a new and ImprovedRock-Drill; and I do hereby declare that the following is a full, clear,and exact description thereof, which will enable Others y skilled in theart to make and use the same, ref-v 'and four drills. The invention alsoconsists in certain novel swivel-heads, in which the drills work, and bywhich they are mounted on the said adjusting-supports, and by which alsothe drills may be pointed and held in any direction, each independent ofthe other.

Figure l is a front elevation of my improvedy drilling-machine. Fig. 2is a section of Fig. l on the line .fr zo. Fig. 3 is a section throughone of the swivel-heads. Fig. et is a view, in perspective, of one ofthe slotted vertical supports for a bracket.

Similar letters of reference indicate corref spondin g parts.

is the truek-fran1e,on the end of which are two strong posts, B,extending from the ground, or thereabout, as high as may be required. CC1 (.l2 G3 represent four slotted cross-bars, extending from one to theother of these posts, and iirmly attached thereto-one at the lower ends,another at the upper ends, and two at intermediate points. They haveways D, upon which vertical supports E F, for the brackets of thedrivingshafts G H, and the swivel-heads, are clamped by the bolts I, foradjustment toward or from the center of the vertical frame. Thesevertical supports E F are also slotted vertically for adjusting thebrackets K up and down. The brackets L for the shafts Gr H arepermanently attached. M M represent driving-shafts mounted horizontallyin brackets N N on the bars C1 C2, G2, respectively, one of whichshafts, M, has a crank, 0, for the application of the power, and theother, M', being connected to M by gears l?. Each shaft has twobevel-wheels, Q, for driving the shafts G H, which wheels are capable ofsliding on the said'shafts and turn loosely, except when clutchedby thefrictionclutches It, which also slide on shafts M M. The hubs S Of thesewheels work in arms T of the brackets N N' of the adjustable supports EF, so as to be moved along said shafts when the supports are moved toshift the drills. The clutches R have hand-levers for connecting ordisconnecting them with the wheels. The swivel-heads, on which thedrills are mounted, consist of the angle-plates U V and W X, the parts Uhaving a tubular projection, Y, extending through tlie plates Z of thebrackets K, with the shafts G H passing through them, so that they mayswing horizontally around said shafts; and they are secured in anyrequired position by clamp-nuts a, screwing up against the plates Z,which have conical rims on the upper sides fitting on conical recessesin the parts U so as to bind when clamped together; and the parts W Xare mounted on the plates V, so as to turn vertically on the axis of theshaft I), for gearing with the drill.

The said short shafts are turned by bevelwheels e f-the latter on shaftsG H-and sliding up and down with the brackets K. The plates W areprovided with tubular proj ectons fw, through plates V and clamping-nutsW', to clamp V and W together to oscillate and hold the drills in anyrequired inclination. The bearings Gr in plates X are for reception ofthe drill feed-rod, which is of the ordinary construction, and not,therefore, shown.

It will be seen that, by these arrangements, a simple and efticientmeans of adjusting the drills to work so that any part of the work infront of the machine, or at considerable distances at either side, maybereached, and that the drills may be worked at any angle, eithervertically or horizontally. It will also be seen that, if it be requiredto take out a drill and put in another, the swivel-head may be swungaround away from the work to a convenient position for the purpose, andthat the change may be ei'ected without moving the truck. In thisrespect my invention has a special advan-l tage over those lnow in use.

Having thus described my invention, I claim as new and desire to secureby Letters Patentports for the drill-rods, constructed and arrangedsubstantially as specified.`

3. The swivel-supports U V W X, constructed and arranged for supportingthe drills on the brackets K, oscillating them vertically andhorizontally, and clamping them thereto, all substantially as specified.

' NORMAN W. ROBINSON.

Witnesses D. B. HINCKLEY, DANIEL E. HAYES.

